package com.xiaobias.a02;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.config.BeanFactoryPostProcessor;
import org.springframework.beans.factory.config.BeanPostProcessor;
import org.springframework.beans.factory.support.AbstractBeanDefinition;
import org.springframework.beans.factory.support.BeanDefinitionBuilder;
import org.springframework.beans.factory.support.DefaultListableBeanFactory;
import org.springframework.context.annotation.AnnotationConfigUtils;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.Ordered;

import javax.annotation.Resource;

public class TestBeanFactory {
    public static void main(String[] args) {
        DefaultListableBeanFactory beanFactory = new DefaultListableBeanFactory();

        AbstractBeanDefinition beanDefinition = BeanDefinitionBuilder.genericBeanDefinition(Config.class).setScope("singleton").getBeanDefinition();
        beanFactory.registerBeanDefinition("config", beanDefinition);

        // 给 BeanFactory 添加一些常用的后置处理器
        AnnotationConfigUtils.registerAnnotationConfigProcessors(beanFactory);

        //  BeanFactory 后置处理器主要功能，补充了一些 Bean 定义
        beanFactory.getBeansOfType(BeanFactoryPostProcessor.class).values().forEach(beanFactoryPostProcessor -> {
            beanFactoryPostProcessor.postProcessBeanFactory(beanFactory);
        });

        // Bean 后置处理器，针对 Bean 的生命周期的各个阶段提供扩展，例如 @Autowired @Resource ...
        beanFactory.getBeansOfType(BeanPostProcessor.class).values()
                .stream()
                .sorted(beanFactory.getDependencyComparator())
                .forEach(beanFactory::addBeanPostProcessor);

        for (String name : beanFactory.getBeanDefinitionNames()) {
            System.out.println(name);
        }

        beanFactory.preInstantiateSingletons();// 准备好所有单例
        System.out.println(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>.");
        System.out.println(beanFactory.getBean(Bean1.class).getInter());
        /*
            学到了什么
            a. beanFactory 不会做的事
                1. 不会主动调用 BeanFactory 的后置处理器
                2. 不会主动添加 Bean 的后置处理器
                3. 不会主动初始化单例
                4. 不会解析 BeanFactory 还不会解析 ${} 和 #{}
            b. bean 后置处理器会有排序的逻辑
         */

        System.out.println("Common:" + (Ordered.LOWEST_PRECEDENCE - 3));
        System.out.println("Autowired:" + (Ordered.LOWEST_PRECEDENCE - 2));
    }

    @Configuration
    static class Config {
        @Bean
        public Bean1 bean1() {
            return new Bean1();
        }

        @Bean
        public Bean2 bean2() {
            return new Bean2();
        }

        @Bean
        public Bean3 bean3() {
            return new Bean3();
        }

        @Bean
        public Bean4 bean4() {
            return new Bean4();
        }
    }

    interface Inter {}

    static class Bean1 {
         private static final Logger logger = LoggerFactory.getLogger(Bean1.class);

        public Bean1() {
            logger.debug("{}", "构造 Bean1()");
        }

        @Autowired
        private Bean2 bean2;

        @Autowired
        @Resource(name = "bean4")
        private Inter bean3;

        public Bean2 getBean2() {
            return bean2;
        }

        public Inter getInter() {
            return bean3;
        }
    }

    static class Bean2 {
         private static final Logger logger = LoggerFactory.getLogger(Bean2.class);

        public Bean2() {
            logger.debug("构造 Bean2()");
        }
    }

    static class Bean3 implements Inter {}

    static class Bean4 implements Inter {}
}
